ITS#7042 Allow unsetting of tls_* syncrepl options.

This can be done by setting them to an empty string value.

libraries/libldap/tls2.c

@@ -760,31 +760,31 @@ ldap_pvt_tls_set_option( LDAP *ld, int option, void *arg )
 		return 0;
 	case LDAP_OPT_X_TLS_CACERTFILE:
 		if ( lo->ldo_tls_cacertfile ) LDAP_FREE( lo->ldo_tls_cacertfile );
-		lo->ldo_tls_cacertfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
+		lo->ldo_tls_cacertfile = (arg && *(char *)arg) ? LDAP_STRDUP( (char *) arg ) : NULL;
 		return 0;
 	case LDAP_OPT_X_TLS_CACERTDIR:
 		if ( lo->ldo_tls_cacertdir ) LDAP_FREE( lo->ldo_tls_cacertdir );
-		lo->ldo_tls_cacertdir = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
+		lo->ldo_tls_cacertdir = (arg && *(char *)arg) ? LDAP_STRDUP( (char *) arg ) : NULL;
 		return 0;
 	case LDAP_OPT_X_TLS_CERTFILE:
 		if ( lo->ldo_tls_certfile ) LDAP_FREE( lo->ldo_tls_certfile );
-		lo->ldo_tls_certfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
+		lo->ldo_tls_certfile = (arg && *(char *)arg) ? LDAP_STRDUP( (char *) arg ) : NULL;
 		return 0;
 	case LDAP_OPT_X_TLS_KEYFILE:
 		if ( lo->ldo_tls_keyfile ) LDAP_FREE( lo->ldo_tls_keyfile );
-		lo->ldo_tls_keyfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
+		lo->ldo_tls_keyfile = (arg && *(char *)arg) ? LDAP_STRDUP( (char *) arg ) : NULL;
 		return 0;
 	case LDAP_OPT_X_TLS_DHFILE:
 		if ( lo->ldo_tls_dhfile ) LDAP_FREE( lo->ldo_tls_dhfile );
-		lo->ldo_tls_dhfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
+		lo->ldo_tls_dhfile = (arg && *(char *)arg) ? LDAP_STRDUP( (char *) arg ) : NULL;
 		return 0;
 	case LDAP_OPT_X_TLS_ECNAME:
 		if ( lo->ldo_tls_ecname ) LDAP_FREE( lo->ldo_tls_ecname );
-		lo->ldo_tls_ecname = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
+		lo->ldo_tls_ecname = (arg && *(char *)arg) ? LDAP_STRDUP( (char *) arg ) : NULL;
 		return 0;
 	case LDAP_OPT_X_TLS_CRLFILE:	/* GnuTLS only */
 		if ( lo->ldo_tls_crlfile ) LDAP_FREE( lo->ldo_tls_crlfile );
-		lo->ldo_tls_crlfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
+		lo->ldo_tls_crlfile = (arg && *(char *)arg) ? LDAP_STRDUP( (char *) arg ) : NULL;
 		return 0;
 	case LDAP_OPT_X_TLS_REQUIRE_CERT:
 		if ( !arg ) return -1;
@@ -812,7 +812,7 @@ ldap_pvt_tls_set_option( LDAP *ld, int option, void *arg )
 #endif
 	case LDAP_OPT_X_TLS_CIPHER_SUITE:
 		if ( lo->ldo_tls_ciphersuite ) LDAP_FREE( lo->ldo_tls_ciphersuite );
-		lo->ldo_tls_ciphersuite = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
+		lo->ldo_tls_ciphersuite = (arg && *(char *)arg) ? LDAP_STRDUP( (char *) arg ) : NULL;
 		return 0;
 
 	case LDAP_OPT_X_TLS_PROTOCOL_MIN:
@@ -823,7 +823,7 @@ ldap_pvt_tls_set_option( LDAP *ld, int option, void *arg )
 		if ( ld != NULL )
 			return -1;
 		if ( lo->ldo_tls_randfile ) LDAP_FREE (lo->ldo_tls_randfile );
-		lo->ldo_tls_randfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
+		lo->ldo_tls_randfile = (arg && *(char *)arg) ? LDAP_STRDUP( (char *) arg ) : NULL;
 		break;
 	case LDAP_OPT_X_TLS_NEWCTX:
 		if ( !arg ) return -1;